|x+3/4| =1/2 Ét o ettttttttttt

2 bình luận về “|x+3/4| =1/2 Ét o ettttttttttt”

1. |x + 3/4| = 1/2

   => \(\left[ \begin{array}{l}x+\dfrac{3}{4}=\dfrac{1}{2}\\x+\dfrac{3}{4}=-\dfrac{1}{2}\end{array} \right.\) 

   => \(\left[ \begin{array}{l}x=\dfrac{1}{2}-\dfrac{3}{4}\\x=-\dfrac{1}{2}-\dfrac{3}{4}\end{array} \right.\) 

   => \(\left[ \begin{array}{l}x=-\dfrac{1}{4}\\x=-\dfrac{5}{4}\end{array} \right.\) 

   Vậy x in {-1/4 ; -5/4}

   Trả lời
2. |x+3/4| =1/2

   ⟺ x+ 3/4=1/2     hay x+3/4=-1/2

   ⟺ x=-1/4             hay x=-5/4

   Vậy x=-1/4 và x=-5/4

   Trả lời